Telephone system



Spt. 15, 1936. 4 G. KINER 2,054,702

TELEPHONE SYSTEM Filed Jan. 27, 1955 5 Sheets-Sheet 1 PIEDI-' neg.

Sept. 15, 1936. K|NER 2,054,702

TELEPHONE SYSTEM lFiled Jan. 27, 1933 5 Sheets-Sheet 2 a, ZnL/ET-Dn vElem-z K 117er' Sept. 15, 1936.

G. KINER TELEPHONE SYSTEM Filed Jan. 27, 1953 5 sheets-sheet 5 *n i Q L@n u...

7l HUEZ-ZDF? EVENT? KZ'UEF spn 15, 1936. VG, NER 2,054,702

TELEPHONE SYSTEM Filed Jan. 27, 1935 5 sheets-sheet 4 zi Y H Urn/ay.

Spt. 15, 1936. G. KINER TELEPHONE SYSTEM 5 Sheets-Sheet 5 Filed Jan. 27,1933 v I Eller-1n Kil-IEP @,w

Patented Sept. 15, 1936 UNITED STATES TELEPHONE SYSTEM Glenn Kiner, ParkRidge, Ill., assgnor to Kellogg Switchboard and Supply Company,lChicago, Ill., a corporation of Illinois Application January 27, 1933,Serial No. 653,773

15 Claims.

My invention relates to automatic telephone systems and moreparticularly to an automatic private branch exchange of the full relaytype.

A feature of my invention is the provision in a telephone system of thetype described of a plurality of channels for interconnectingsubscribers lines at the exchange.

Another feature of my invention is the provision in such a telephonesystem of relay means controlled by the calling subscriber for selectingan idle channel.

A further feature of my invention is the provision of relay meansassociated with the selected channel for connecting the callingsubscribers line to the line of the called subscriber provided the saidcalled'line is idle.

Other features will be disclosed from time to time as the description ofthe invention progresses. l

In the accompanying drawings like reference characters indicate likeparts and Fig. 1 is a schematic drawing of the apparatus comprising theline and selector circuit;

Fig. 2 shows the connector circuit;

Figs. 3 and 4 show the channel selecting apparatus; and

Fig. 5 shows a portion of the channel selecting apparatus in detail.

When Fig. 2 is placed to the right of Fig. 1 and Fig. 3 is placed aboveFig. 4 the entire circuit arrangement is disclosed.

The present invention will be best understood from a consideration ofthe following detailed description taken in connection with theaccompanying drawings forming a part of this specification, with theunderstanding, however, that the invention is not confined to any strictconformity with the showing of the drawings but may be changed ormodified so Vlong as such changes and modifications mark no materialdeparture from the salient features of the invention as expressed in theappended claims.

The system of my invention is shown in the drawings as a lO-partyexchange provided with three channels for interconnecting thesubscribers. Of course, the system may be enlarged indefinitely byhaving a second, third; etc. channel selector, that is, have one channellead to other channel selecting means and then to still another.Referring particularly to Fig. 1 of the drawings the line conductors 2and 3 at the left of the drawings lead to a subscribers station, line I,which is equipped with the usual automatic substation equipment andterminates at the private branch exchange in the line circuit IL whichcomprises line relay ILR and the cut-E relay ICO. Each of thesubscribers stations terminate at the ex change in a similar linecircuit. A line channel relay ILC connects the line circuit IL to theselector circuit SC, also shown in Figfl, which leads to a connectorcircuit CC, shown in Fig.2, and thence to the subscribers station lineI0 of Fig. 2, through a line circuit IOL which is similar to the linecircuit IL. f

In Fig. is shown the line channel relay ILC which is the same one shownin Figs. 1 and 3.

Associated with the line I are three line channel relays ILC, ILCA andILCB, which serve to connect the horizontal commons' IH to 'the verticalcommons IV, 2V or 3V, which lead to respective selector circuits andconnector circuits each of which comprises a channel. If the line Iinstitutes a call and all the channels are idle the rst link'channelrelay ILC will operate to connect the line to the commons IV of'the rstchannel. 'If the first channel is busy the second link channel relayILCA will operate to connect the horizontal commons IH to the verticalcommons 2V of the second channel and if the rst two channels are busythe third relay ILCB will connect the line I to the third channel thruthe verticalcommons 3V.' In other Words the calling linewill beconnected to the rst idle channel in the exchange. It is to beunderstood that the terms horizontal commons" and vertical commons areused only for the purpose of facilitating the description of theinvention and refer only to the drawings to distinguish between thecommons for the lines and the commons for the channels. In practice thecommons may be neither vertical nor horizontal but may proceed in anydirection.

In Figs.3 and 4 I show the full channel selecting mechanism necessary ina line exchange. The link channel relays ILC, ZLC, etc. are shown minusthe contacts necessary to connect the horlzontal and vertical commonswhich are shown in Figs. 1 and 5. The link channel relays ILCA, ZLCA toI IlLCA are associated with the second channel and the link channelrelays ILCB to IIBLCB are associated with the third channel. Thecontacts shown at the extreme left of Figs. 3 and 4, marked dI, d2 todIU are associated with line relays such as I LR of Fig. 1 oftherespective subscribers lines and are controlled by the switchhook at thesubscribers station in the Well known manner. Should a callingsubscriberoperate his switchhook the line relay is operated and the contact dI todln associated with his line'is operated to connect ground thru thecontact of his associated link channel relay LC of the iirst channel.

Should this channel be idle the channel selecting relay ICSR is operatedto establish a circuit for the link channel relay LC which connects thehorizontal commons associated with the calling line to the verticalcommons leading to the selected channel.

A better understanding of the invention can be obtained by tracing acall from a calling subscriber such as line I toa called subscriber suchas line Ill. The operation is as follows. The calling subscriber at lineI removes his receiver from the switchhook. This establishes anoperating circuit for the line relay ILRwhich' is operated by currentflowing from grounded battery thru winding of ILR, normaljcontact I,line conductor 2, thru the cl-osedswitclihookcontacts at subscribersstation line I, line conductor 3, normal contact.4to..grou-nd. The relayILR operates over this circuit and closes its alternate contact dI whichplaces groundupony the-conductor cI;

Referring nojwV particularly to Fig. 3, the ground upon the conductor eIlestablishes an operating circuitj for the master line relay MLR ofFig;` 4. This circuitcan be traced from grounded" contact dI, conductoreI, contact Ig, conductor 8, contact Iga, `conductor 8a, contact lIglb,f.conductors Stand I0' thru thecoil of master line relay MLR to groundedbattery. The relay operates and attracts; its contacts AI, A2 to AI I.The closure-,of contact AI establishes an energizing circuit for thechannel selecting relay ICSR; This energizing' circuit can be tracedfrom grounded-1 battery thru the relay ICSR, normal contactszbIIl, b9;178,' b1 to bI and ground at alternate contact aI; The relay ICSRoperatesand'attractsfits contacts 5 which establishes anxoperatingcircuitv for the link channel relay ILC associated with the calling line#L This circuiticanbetracedfrom grounded battery thru the-winding ofthef relay ILC, its make-beforebreakv contact fl, conductor 6, alternatecontact 5; conductor II, alternate contacts a2, and dI to AVground. Alocking circuit for the link channel:-relay ILC is closedthru itsyalternate contact Ig. to ground .at alternate contact dI. The relay ILCVattractsv its contacts Ih, I y' and I 7c to connect-thehorizontal-commons IH to the vertica'lfconrrnonsV IV associated with therst channel.l Uponthe Voperation of the link channel relay;A ILC the',energizing circuits of the relays ML'R' and ICSR- are broken and thesame restored t'o normal.

Ifaf'second call isinstituted, while the rst is still'unnishedby` a linesuch as-line'4 (not shown) theline' relay associated with the linecircuit of that line will operate to close its alternate-contactd4'shown in Fig. 3.

The grounding-.of contact d4 causes the operation of the master `linerelay MLR, the circuit beingftraced from'. alternate contact: d4, normalcontacts-4g,` lgazand 4gb, conductors 9 and I0. The relayMLRzattractsits-contacts aI to all and extends ground thru its alternate contact alto alternate contact bI of the link channel relay ILC, whiclris-.holdingthe rst connection, conductorf I4; normal contact bla of ILCA, normalcontact b2a, b3a; b4a, b5a.' ba, conductor I5, blagandrso on toconductor I5 and relay ZCSR which' operates and attracts its armatures5a whicha-closesan energizing` circuit for the link channel relay4LCA-associated with the calling line4. This circuit can be traced fromgrounded battery-, the; windingl of- 4LCA, conductor II,alternate-:contact 5a, conductor I8, alternate contacts a5 and d4 toground. The relay 4LCA operates similarly to relay ILC and connects thehorizontal commons IH associated with line 4 to the Vertical commons 2Vwhich lead to the second channel.

Should a third call be instituted by line Ill while the rst two callsare still being carried on, the line relay LR will close its alternatecontact dl to ground the conductor eID which leads thru normal contactsIIlg, IUga, IIlgb and conductor II) to the master line relay MLR whichoperates as above explained to close its alternate contact a! to extendground thru alternate contact bI of ILC, which operated to establish thefirst call, conductor I4, normal contacts bla, b2a, b3a, and alternatecontact b4a of link channel relay 4LCA, which operated to establish thesecondcall, conductor I 9, normal contacts bIb to bIElb, and relay 3CSRwhich thereupon operates to attract its contacts 5b which closes anenergizing--crcuit for the link channel relay IULCB which operated bycurrent flowing from grounded -battery thru thevwinding of the relay,normal contact fIDb, conductor 2I, alternate contact 5b, conductor 22,alternate contacts aII and dI0 to ground.. 'I'he'relay IOLCB thereuponoperates and connects the line II)y to the vertical commonsfSV whichleadto the third channel.V

lIf another'line, such asline,3, desires to institutea call while theother three calls are still in progress its line relay will close itsalternate contact b3 whichwill furnish ground for the master line relayMLR, as above explained, which will energize to supply ground thru itscontact aI, alternate contact bl, normal contacts bla, etc. to alternatecontact b4a, conductorv I9, normal contacts bIb, etc. to alternatecontact VbIllb and conductor 23 with no result as all the channels arebusy.

Referring-'again to'Fig. l'and the original call instituted by line Ithe energization of the link channel relay ILC above described connectedthe horizontal commons H to the vertical commons V which lead to: thechannel comprising the selector SCr and the connector CC closedenergizing circuit for the dialing relay DR which circuit can beltracedfrom grounded battery thru the lower winding of the dial relay DR,conductor 24, alternatecontact Ic, horizontal common H, the lineconductor- 3, the closed switchhook contacts at line I, line conductor2, horizontal common H, alternate contact Ih, conductor 25, thru theupper' winding of dialing relay DR to ground. The operation of thedialing relay DR causes the attractionof. alternate contact 26 whichcloses an obvious energizing circuit for the switching relay SW whichcloses alternate contact 21 to establish anenergizing circuit for thecut-off relay ICO Whichis -operated by current ilowing from groundedbattery thru resistance r, alternate contact 21 ofISW, vertical commonV, alternate contact Iy' of ILC, horizontal common H, thru the windingof ICO to ground. Relay-ICO operates to interrupt' the circuit of linerelay ILR which deenergizes and opens the energizing circuit of relayILC but before this circuit is broken a lockenergizing circuit oftheswitching relay SW but due toits slow-to-release -construction theTsa-idrelay remains energized andgroundis supplied to the dialingconductorDCwhich causes the operation of the electromagnet MI by current owingfrom grounded .battery thru the winding of the .electromagnet Ml, normalContact 33, dialing conductor DC, normal contact 321;of RC, coni ductor'3|, alternate contact `3|) of SW, normal contact 26 of. DR. Thev relayMl energizes and attracts its alternate contact' 34. After the firstinterruption by the dial CD the relay DR is again energized to attractits Ycontact 26 and again establish an energizing circuit for theswitching relay SW which has not restored due to'itsvcon-V struction andthe opening' of contactf26 breaks the energizing circuit of the` relayM| butas it is also ofk slow-to-release. construction'its .alternatecontact 34 is maintained in its 'operated position until. an energizingcircuit for the relay C| and a holdingcircuit for MI is established.This circuit can be traced from grounded battery, the winding of relayM|, relay CI alternate contact 34 of Ml, conductor 35, alternate contact36 of SWV to ground. 'I'he relay CI operates over this circuit andattracts its contact 33 to remove the relay MI from the dialingconductor ,DCL The second interruption of theline conductors 2 and 3 bythe dialV D again deenergizes the' relay DR which restoresnits contact26 l.to normal to place Yground upon the dialing conductor DC as aboveexplained whichrthereupon causes the energization of the relay.M2current ilowing from grounded battery thru rthe winding ofthe relay M2;normal contacti38, Ialternate contact 33 ofv CI, to the groundeddialingl conductor DC. Upon the reenergization of dialing relay DR theenergizing circuit of the relay M2 is interruptedbut an energizingcircuit for the' relay C2 ,thru` the alternate contact 39 vof,M2 isestablished over the previously traced circuit: so that upon the nextinterruption of the'line conductors and the subsequent deenergization ofthe dialing relay vDR the grounded dialing conductor DC is extended tothe next set of relays with the same result as heretofore explained.This is repeated until :upon the last interruption of-'the linetherelays MIU and CID are operated to connect the calling subscriber tothe desired'line. The, relays Mvl!) and CID are maintained energized bycurrent flowing from grounded battery thru the winding of MIO, theWinding'ofI relay Clil,l alternate contact 43 of MID, conductor 35,and-alternatezcontact 36 of SW to ground. Y Y Y Upon the firstrestoration of the dialing relay DE the slow dialing relay-SDR wasoperated by current flowing from grounded battery Athru ythe winding ofSDR to ground at normal ncontact 26 of DR. Due to the slow-to-releaseconstruction ofV this-relay it remains in its energized position untilafter the last interruption of the calling line and the subsequentenergization of the dialing relay DR at which time it restores itsYcontact 46 to normal thereby establishing energizing circuits for thecut-off relay IGCO of the called line and either` the ringing controlrelayl RC or busy .test relay BTR depending upon the busy or idlecondition of the called line. 'The' three lconductors leading to eachline fromthe contacts of relays Cl tov CIO are multipled between theconnector circuits of the channels. Y

If the line is busy the busy test'relay BTR will be operated by'currentflowing from grounded battery thru the winding of BTR,'normal contact4T. of RC, conductor 48, normal contact 46 orSR,

conductor 49, alternate contactr45 of C|||,rconductor 5|),V thewindingof cut-01T relay IBCO to ground. The busy test relay BTR operates toconnect a busy'tone BU to the calling line which informs .the callingsubscriber vthat the desired line is busy at this time. The circuit forthis tone can be traced from BU, alternate contacts 54 of BTR, .normalcontact 55 of RC, normal contact 56 of IR, over the heavily markedconductors to the calling subscribers line I;

, If the calledline is idle the ringing control relay. RCR will operatebefore the busy test relay B'I'R can do so and will vattractitslarmature 41 to disconnect the busy test relay BTR and prevent itsenergization to give a false busy test to the calling subscriber. .Theattraction of contact 4l of RC shunts out thev high resistance windingRf andV allows the energization of the cut-oil' relay associated withthe line of the called party which relay |0C0foperates and attracts itscontacts 5| and 52 to disconnect the line relay |0LR from the lineconductors.v The energization of ringing control relay RC provides anenergizing circuit for Ythe ringing relayRI which .circuit can be tracedfrom grounded battery thru a constantly rotating interrupter I, Windingof ringing relay RI, alternate contact 5l of RC, normal contact 58 ofRT,` alternate contact 59 of SW to ground. The ringing relay lRI is thusalternatelyl energized and deenergized to connect ringing currentsupplied from the generator Gen. to signal the'subscriber at'line |0.The path for the ringing current can be traced from the generator Gen.,alternate contact 56 of RI, alternate contact 55 ofV RC, over theheavily marked conductor, alternate contact 6| of CIO, thru the callbell at line ID, .back thru alternate contact 44 of CID, alternatecontact 62 of RC, and alternate Contact 60 of RI` to the generator,

fA ringing tone is'supplied vthe calling subscriberv from the tonepunching T, .alternate contact- 64 of RI over the heavily markedconductors to the calling station. if The subscriber at line l0 removeshis receiver from the switchhook invanswer .to the signal and therebycloses an ,energizing circuit for the supervisory'relay SR whichattracts its contacts 63 to establish an obvious energizing circuitr forthe ringing ltrip relay .RT Which closes vits alternate contactv 58 toestablish a locking circuit for itself and to also interrupt theenergizing circuit of the ringing relay RI which restores anddisconnects ringing current from the called line and completesthe'conversational circuit by the restoration of its contacts 56 and 60.

Y Upon the termination of conversation Ythe calling subscriber replaceshis receiver uponits switchhook and thereby causes the interruption ofthedialing relay DR which restores its contact 26 to normal and therebyopens the Yenergizing circuit of the switching relayrSW which restoresits' contact 59 to interrupt Vthe locking circuit of the ringing triprelay RT and .restores its alternate contact 36 to interruptthe lockingcircuit of the relays MIO andClU which restore to normal and disconnectthe connectorcircuit from the line circuit at contacts 6| and 44. Thereplacement ofthe called vsubscribers receiver interrupts the`energizing circuit of the supervisory: relay SR which also restores tonormal. The ,restoration of Acontact29 of SW to normal breaksthe lockingcircuit of the link channel relay |LC which releases-the rst channel andprepares -it for subsequent seizure by another calling line. l

Cil

Having described my invention, what Ihclaim is new and desire to .secureby United States-Letters Patent is:

1;v An automatic telephone system comprising a plurality ofA subscriberslines, a plurality of channels for interconnecting any twoY of saidlines, horizontal commons connected to. relay contacts in each channel,vertical commons for each channeliconnected to other contacts of thesaid relays, channel selecting means consisting ofx relays exclusivelyfor automatically selecting an idle channel and connecting a callingline thereto through the medium of said relay contacts.

2. An automatic telephone system comprising al plurality of subscriberslines, a plurality of channels for interconnecting any two of ,saidlines, horizontal commons connected to relay contacts ineach channel,verticalcommons for each channel connected to other contacts of thesai'darelays, channel selecting means consisting of relaysexclusivelyfor automatically-selecting an idle channelV and connecting acallingline thereto through the medium of said relay contacts, andzmeansfor.V rendering busy said selected channel.

3; An all-relay telephone system comprising subscribers lines, a:pluralityy of channelsV each comprising a connector circuit and a:selector circuit for interconnecting said lines, .horizontal commonsassociated with individual calling lines, vertical commons associated.with individual channels'and means for: connecting said horizontal andvertical commons;

4. An all-relay'telephonesystem comprising subscribers lines, aplurality of channels, anconnector circuit and a selectorl circuit foreach channel for: interconnectingsaidv subscribers lines, horizontalcommonsassociated withindividual calling subscribers lines and allthechannels', vertical commons associatedwith individual channels andallthe lines and. means for con.- necting said horizontal and-verticalcommons;

5'. An all-relay telephone system comprising subscribers lines, aplurality of channels, a connector circuiti and a': selector circuit foreach channel for interconnectingsaid; subscribers lines, horizontalcommons for each line associatedxwith all the channels, vertical commonsfor each channel associated with` all the lines, a line channel relayforeach line` operable `toV connect the horizontal commons for that linetoa set of vertical commons anda channel selecting relay for eachchannel controlling said linechannel relay.

6. An all-relay telephone system comprising subscribers lines, aplurality of channels for interconnecting said subscribers linesychannel selecting means operable upon the initiation of a callcomprising a line channel relay for each line in each channel, a channelselecting relay for each channel, the channel selecting relay of the rstidle channel operable upon the initiationA of al call to operate theline channel relay associated with the calling linetov connect the saidline to said idle channel. Y

'7. An all-relay telephone system comprising subscribers lines, aplurality of channels for interconnecting said lines, horizontal commonsextending each lineto each channel, vertical commons for each channelassociated with each of said lines, a relay operable to connect thehorizontal commons of a-callingline to the vertical commons of an idlechannel, and relaymeans controlling said relay.

8. An all-relayV telephone system. comprising calling and calledlines, aplurality of channels for interconnecting-said lines, horizontal commonsforeach line for associating each line with each .channel and verticalcommons forrassociating each channel with each line, a connectorcircuitanda selector circuit for each channel, relay means operativeupon the initiation of acall to select an idle channel, dialing means atsaid calling line, and means responsive to said dialing means-,toconnect said calling line to a-called line.

9. An all-relay telephone systemcomprising calling and called lines, aplurality of-channels for interconnecting said lines, horizontal commonsfor each line for associatingxeach line with each channel and verticalcommons. for associating each channel .with each line, a connectorcircuit andazselectorcircuit for each channel, relay means operativeupon the initiation of a call to select an-idle channel, dialing meansat said calling line, means responsive to said dialing means to connect'said calling line to a called line, and means preventing said connectionif saidcalled line is busy. l

10. An all-relay'telephone, system comprising calling and called lines,a plurality of channels for interconnecting saidlines, commonsassociated with individual channels, channel selecting means comprisingaline channel relay for each line located r in the 'respective channels.

11. An all-relay telephone system comprising calling and called lines, aplurality of channels for interconnecting said lines, commons connectingeach lineto each channel and eachchannel with each line, channelselecting meanscomprising a line channel relay for each line located inVthe respective channels, and achannel selecting relay individual to achannel controlling the line channel relays in the channel;

12. An Vautomatic telephone system comprising subscribers lines, aplurality of channels for interconnecting two of said lines, horizontalcommons individual to the lines, Vertical commons individual to thechannels, a line channel relay for each line in each channel, operableto connect the horizontal' and vertical commons, a channel selectingrelay in each channel'controlling the said line channel relays in therespective channels, and circuit connections for said relays whereby thechannel selecting relay in the first idle channel operates the linechannel relay in that channel associated with the calling line.

13. An automatic telephone system comprising subscribers lines, aplurality of channels for interconnecting two of said lines, horizontalcommons individual to the lines,l vertical commons individualto thechannels, a line channel relay for each line in each channel, operableto connect the horizontall and vertical commons, a channel selectingrelay in each channel controlling the said line channel relays in therespective channels,V circuit connections for said relays whereby thechannel selecting relay in the first idle channel operates the linechannel relay in that channel associated with the calling line, andmeans for extending another call to the next channel.

14. An automatic telephone system comprising subscribers lines, aplurality of channels for interconnecting two of saidlines, horizontalcom- -mons individual to the lines, vertical commons individuallto thechannels, aline channel relay for each line in each channel, operabletoconnect Vthe horizontal and vertical. commons, a. channel selectingrelayy ineach channel controlling the said line channel relays in therespective channels, circuit connections for said relays whereby thechannel selecting relay in the rst idle channel operates the linechannel relay in that channel associated with the calling line, andmeans preventing the operation of the channel selecting relay associatedwith a busy channel.

call to select an idle channel, said channel selecting means comprisinga line channel relay in each channel connected to individual respectivelines by horizontal commons, vertical commons for each channel extendingfrom contacts of one line channel relay to contacts of another linechannel relay and relay means operable to operate the line channel relayassociated with a calling line to connect the horizontal and verticalcommons at that point.

GLENN KINER.

